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A Noise Suppression Device and Suppression Method for Distributed Polarization Crosstalk Measurement of Optical Polarization Devices

A polarization crosstalk and polarization device technology, applied in the field of optical fiber measurement, can solve the problems of increasing polarization crosstalk noise and improving the signal-to-noise ratio of the test system, achieving the effect of reducing requirements, facilitating efficient construction, and simple optical path structure

Active Publication Date: 2017-11-21
HARBIN ENG UNIV
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Problems solved by technology

However, none of the above devices have significantly improved the signal-to-noise ratio of the test system, and most of them are polarization-maintaining fibers, which will cause an increase in polarization crosstalk noise

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  • A Noise Suppression Device and Suppression Method for Distributed Polarization Crosstalk Measurement of Optical Polarization Devices
  • A Noise Suppression Device and Suppression Method for Distributed Polarization Crosstalk Measurement of Optical Polarization Devices
  • A Noise Suppression Device and Suppression Method for Distributed Polarization Crosstalk Measurement of Optical Polarization Devices

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Embodiment Construction

[0050] In order to clearly illustrate the method and device of the present invention for improving the measurement performance of distributed polarization crosstalk of optical devices, the present invention will be further described in conjunction with the examples and accompanying drawings, but the protection scope of the present invention should not be limited by this.

[0051]The invention provides a noise suppression device and method for measuring distributed polarization crosstalk of an optical polarization device, injecting linearly polarized transmission light into the fast axis (or slow axis) of the optical device to be tested, and at the defect point, the transmission light will Weak coupling light is generated in the slow axis (or fast axis); the polarization beam splitter separates the transmitted light and the coupled light, and makes the two transmit in the two coherent arms of the optical path correlator; The attenuation of light energy, the reduction of signal d...

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Abstract

The invention belongs to the technical field of optical fiber measurement, and in particular relates to a noise suppression device and suppression method for distributed polarization crosstalk measurement of an optical polarization device. A noise suppression device for distributed polarization crosstalk measurement of optical polarization devices, including a wide-spectrum light source, a polarizer, a first optical fiber rotary connector, a second optical fiber rotary connector, an optical fiber device to be tested, an optical path correlator, and a polarization crosstalk Detection and signal recording device. The invention uses a polarization beam splitter to completely separate the transmission light from the coupling light, avoiding the influence of the interference shot noise; on the basis of controlling the thermal noise of the circuit, an attenuator is used to attenuate the transmission light, so that the coupling light becomes the main detection light, so that Shot noise becomes the main noise that limits the signal-to-noise ratio of the system. Using the method provided by the invention to adjust to appropriate parameters can keep the dynamic range of the system unchanged, and the signal-to-noise ratio can be increased by 20-40dB, effectively improving the measurement sensitivity.

Description

technical field [0001] The invention belongs to the technical field of optical fiber measurement, and in particular relates to a noise suppression device and suppression method for distributed polarization crosstalk measurement of an optical polarization device. Background technique [0002] Polarization optical devices are an important part of high-precision optical measurement and sensing systems. At present, the performance testing and evaluation methods and devices of optical devices are backward, which seriously hinders the development of high-precision optical measurement and sensing systems. For example, the chip extinction ratio of lithium niobate integrated waveguide modulator (commonly known as Y waveguide), the core device of high-precision fiber optic gyroscope, has reached more than 80dB; The rate is around 50dB (according to the definition of energy, it is 10 5 ), the highest resolution is the Model 4810 polarization extinction ratio developed by dBm Optics of...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02
Inventor 杨军梁帅李创喻张俊苑勇贵吴冰彭峰苑立波
Owner HARBIN ENG UNIV
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